Robot cleaner



FIG. 1 is a perspective view of a robot cleaner, showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is a another side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is another perspective view thereof in an alternate configuration.

The broken lines are for environmental purpose only and form no part of the claimed design. 

CLAIM The ornamental design for a robot cleaner, as shown and described. 